We review different dark energy cosmologies. In particular, we present the Λ CDM
cosmology, Little Rip and Pseudo-Rip universes, the phantom and quintessence …

We review recent developments (up to January 2004) of the Liouville field theory and its
matrix model dual. This review consists of two parts. In part I, we review the bosonic Liouville …

In this review we describe our current understanding of the properties of open string
tachyons on an unstable D-brane or brane–antibrane system in string theory. The various …

We study a dark energy scenario in the presence of a tachyon field ϕ with potential V (ϕ)
and a barotropic perfect fluid. The cosmological dynamics crucially depends on the …

In dark energy models of scalar-field coupled to a barotropic perfect fluid, the existence of
cosmological scaling solutions restricts the Lagrangian of the field φ to p= Xg (Xe λφ) …

We propose a new interpretation of the c= 1 matrix model as the world-line theory of N
unstable D-particles, in which the hermitian matrix is provided by the non-abelian open …

We compute the emission of closed string radiation from homogeneous rolling tachyons. For
an unstable decaying Dp-brane the radiated energy is infinite to leading order for p⩽ 2 and …

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We compare the standard single scalar field inflationary predictions with those of an
inflationary phase driven by a tachyon field. A slow-roll formalism is defined for tachyon …

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